/*
 * Copyright 2002-2021 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.github.fishlikewater.raiden.core.references.org.springframework.scheduling.support;

import io.github.fishlikewater.raiden.core.Assert;

import java.time.temporal.Temporal;

/**
 * Extension of {@link CronField} that wraps an array of cron fields.
 *
 * @author Arjen Poutsma
 * @since 5.3.3
 */
final class CompositeCronField extends CronField {

    private final CronField[] fields;

    private final String value;

    private CompositeCronField(Type type, CronField[] fields, String value) {
        super(type);
        this.fields = fields;
        this.value = value;
    }

    /**
     * Composes the given fields into a {@link CronField}.
     */
    public static CronField compose(CronField[] fields, Type type, String value) {
        Assert.notEmpty(fields, "Fields must not be empty");
        Assert.hasLength(value, "Value must not be empty");

        if (fields.length == 1) {
            return fields[0];
        }
        else {
            return new CompositeCronField(type, fields, value);
        }
    }

    @Override
    public <T extends Temporal & Comparable<? super T>> T nextOrSame(T temporal) {
        T result = null;
        for (CronField field : this.fields) {
            T candidate = field.nextOrSame(temporal);
            if (result == null ||
                    candidate != null && candidate.compareTo(result) < 0) {
                result = candidate;
            }
        }
        return result;
    }

    @Override
    public int hashCode() {
        return this.value.hashCode();
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof CompositeCronField)) {
            return false;
        }
        CompositeCronField other = (CompositeCronField) o;
        return type() == other.type() &&
                this.value.equals(other.value);
    }

    @Override
    public String toString() {
        return type() + " '" + this.value + "'";

    }
}